The Blastula reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Blastula

The blastula is an early stage of embryonic development in animals. The blastula follows the morula and precedes the gastrula in the development sequence. A blastula has more than 64 cells, with a large central cavity called the blastocoel.

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